fix(think-mode): disable thinking parameter for Z.ai GLM models

Z.ai GLM models don't support thinking/reasoning parameters.
Ensure these are omitted entirely to prevent empty responses.

Fixes #980

Community-reported-by: @iserifith

src/hooks/think-mode/switcher.ts

@@ -154,8 +154,7 @@ export const THINKING_CONFIGS = {
       "zai-coding-plan": {
         extra_body: {
           thinking: {
-            type: "enabled",
-            clear_thinking: false,
+            type: "disabled",
           },
         },
       },